TEKTRONIX D12 (5112) Dual Beam Oscilloscope System, UP TO 4 OR MORE TRACES are possible depending on plug-in modules used, DC to 2 MHz Bandwidth, Solid State, Large 6.5" Diagonal CRT. Flexible scope system perfect for audio applications and general purpose bench work. The dual beam feature is great because the CRT has two guns so you don't have to put up brightness robbing alternate sweep or chopping as with regular dual trace scopes. Utilizes plug-in modules to allow you to optimize the configuration for your requirements and change as your needs change. Plug-in are available to display 4 or even more traces. Tek also made a Spectrum Analyzer plug-in for this scope. Accepts up to three 5000-Series plug-ins, two Vertical and One Horizontal.  Comes with 5B10N, Time Base, 100 nS to 5S/div. Horizontal Plug-in, and your choice of Vertical plug-ins. Rack-mount format, 5 1/4 H x 19 D x 19 W, 24 lbs, Shipping Wt. 32lbs.

o Dual Trace System: w/2x 5A15N, Vertical Amp 1 mV to 5V/div
o Triple Trace System: w/1x 5A18N, Dual Trace Amp 1 mV to 5V/div and 1x 5A15N, Vertical Amp
o Quad Trace System: w/2x 5A18N, Dual Trace Amp 1 mV to 5V/div
 

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Tektronix 5112 Dual Beam Oscilloscope (Dual-Trace system, bench configuration shown):

Tektronix 5000 Series Rackmount Configuration:

Tektronix 5A15N and 5A18N  Amplifiers:

Tektronix 5B10N, Time Base:

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